SDOT sent this out as an alert, so in case you commute through the area – given that we heard multiple reports it was tough going to get there earlier today, maybe this will save you some trouble on the way home:

Today’s Deck the Hall Ball, a sold-out concert at the Key Arena, could impact the afternoon commute. Some 8,000 fans of Mumford and Sons, Death Cab for Cutie and Foster the People, will begin arriving for the concert by mid-afternoon and likely produce heavier traffic than usual between I-5 and the Seattle Center and on surrounding streets in the vicinity. The 107.7 The End’s event, which begins at 4 p.m. wraps up at 11 p.m., will add to the late evening traffic in the area as well.